Obtaining momentum distibution from Green's functions

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How does one obtain the momentum distribution (n_k) from the green functions Is there a software for it if so where can I get it
Thanks
Emman1
 

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Momentum of what, in which system and under what conditions?

Does this help?

http://www2.fz-juelich.de/nic-series/volume31/mavropoulos.pdf
 
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I am working on electron correlation in an 8 X8(64 site) square lattice at half filling using the 2-D Hubbard model. using quantum monte Carlo I was able to obtain the Green functions. To get the momentum distribution I am required to calculate the Fourier transform of the Green function. The problem is I do not know how to go about calculating the Green functions and plotting it. Can it be done with Matlab?
 

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